Please use this identifier to cite or link to this item: https://doi.org/10.1364/AO.46.001050
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dc.titleGlobal and local coordinates in digital image correlation
dc.contributor.authorSun, W.
dc.contributor.authorQuan, C.
dc.contributor.authorTay, C.J.
dc.contributor.authorHe, X.
dc.date.accessioned2014-06-17T06:22:52Z
dc.date.available2014-06-17T06:22:52Z
dc.date.issued2007-03-01
dc.identifier.citationSun, W., Quan, C., Tay, C.J., He, X. (2007-03-01). Global and local coordinates in digital image correlation. Applied Optics 46 (7) : 1050-1056. ScholarBank@NUS Repository. https://doi.org/10.1364/AO.46.001050
dc.identifier.issn00036935
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/60409
dc.description.abstractDigital image correlation (DIC) is commonly used to measure specimen displacements by correlating an image of a specimen in an undeformed or reference configuration and a second image under load. To establish the correlation between the images, numerical techniques are used to locate an initially square image subset in a reference image. In this process, choosing appropriate coordinates is of fundamental importance to ensure accurate results. Both global and local coordinates can be used in shape functions. However, large rigid body rotations and deformations are accurately obtained by using global rather than local shape functions. In addition, points located after displacement may not be at an integer pixel distance from the original position. Hence subpixel displacement estimation methods such as interpolation or fitting of correlation coefficients are essential. A solution using the least-squares method is employed by choosing proper coordinates, and the feasibility of using local coordinates is demonstrated and validated with a mathematical model. Both simulated and experimental results show that the proper choice of coordinates does ensure the reliability and improve the accuracy of measurements in DIC. © 2007 Optical Society of America.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1364/AO.46.001050
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentMECHANICAL ENGINEERING
dc.description.doi10.1364/AO.46.001050
dc.description.sourcetitleApplied Optics
dc.description.volume46
dc.description.issue7
dc.description.page1050-1056
dc.description.codenAPOPA
dc.identifier.isiut000244500800007
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